-
8/19/2019 Ch 2 - Guide to Physics Practicals
1/20
1. Measurement and Observation
2. Presentation of results
3. Graphical Work
GUI! "O P#$%I&%
P'(&"I&()%
-
8/19/2019 Ch 2 - Guide to Physics Practicals
2/20
M!(%U'!M!*
" (*
O+%!',("IO*
-
8/19/2019 Ch 2 - Guide to Physics Practicals
3/20
1.1 Points and Interval 'e-uired
)inear "rend / readin0sre-uired
&urved "rend readin0sre-uired
%ensible interval must be chosen
e.0. 1cm d 4cm 5"ake until / readin0s6
27cm8 37cm8 97cm8 7cm8 /7cm847cm
-
8/19/2019 Ch 2 - Guide to Physics Practicals
4/20
1.2 'epeated 'eadin0s.
&andidates e:pected to repeat readin0s and
calculate avera0e. 5at least 3 readin0s6
ALL ra; data 5readin0s6 must be recorded8for e:ample to
-
8/19/2019 Ch 2 - Guide to Physics Practicals
5/20
1.3 %i0nii0ures
"he number of si0ni
-
8/19/2019 Ch 2 - Guide to Physics Practicals
6/20
If bi00er numbers8 for instance
'esistance of voltmeter is 7 777?8 +etter to
;rite in in scienti
-
8/19/2019 Ch 2 - Guide to Physics Practicals
7/20
• >or lo0arithmic -uantities8 the no.
of decimal should be considered. Itis sensible to -uote lo0 : to
3d.p ifthe values of : is correct to 3s.f
-
8/19/2019 Ch 2 - Guide to Physics Practicals
8/20
P'!%!*"("IO* O> ("(
-
8/19/2019 Ch 2 - Guide to Physics Practicals
9/20
2.1 &olumn headin0s
It must have=
( -uantitA
( unit
!:amples = lBcm or l 5cm68 t Bs or t 5s6
In case of lo0arithms lo0 5lBcm68 lo05tBs6
-
8/19/2019 Ch 2 - Guide to Physics Practicals
10/20
2.2 &onsistencA of ra; data
()) ra; data should be recorded to
the same number of decimal places;hich should be consistent
'eadin0 526 is acceptable since all thera; data are 0iven to the
same
de0ree of accuracA
-
8/19/2019 Ch 2 - Guide to Physics Practicals
11/20
2.3 %i0ni
-
8/19/2019 Ch 2 - Guide to Physics Practicals
12/20
3. Graphical Work
i. &hoice of scale
ii. Plottin0 Pointsiii. )ine of +est
-
8/19/2019 Ch 2 - Guide to Physics Practicals
13/20
3.1 &hoice of scales.
%cale must be chosen so that plotted points ;illcoverBoccupA
more than hal the !a"h for both: a:is and A a:is.
-
8/19/2019 Ch 2 - Guide to Physics Practicals
14/20
!ach scale must be labeled ;ith the -uantitAand units.
&hose scale that is easA to read!.0. 1=18 1=28 1=8 1 =17
Unacceptable scales are 1=38 2=3 etc.
-
8/19/2019 Ch 2 - Guide to Physics Practicals
15/20
3.2 Plottin0 Points D )ine +est >it
Points should be accuratelA plotted8 to ;ithinone half of the
small s-uare.
Plot points usin0 cross or a dot.
)ine best
-
8/19/2019 Ch 2 - Guide to Physics Practicals
16/20
-
8/19/2019 Ch 2 - Guide to Physics Practicals
17/20
3.9 &alculation of Gradients
()) ;orkin0 must be sho;n
"he trian0le should be dra;n and thecoordinates of the
vertices clearlA labeled.
"he coordinates used ;hen calculatin0 the
0radient must be on the strai0ht line.
-
8/19/2019 Ch 2 - Guide to Physics Practicals
18/20
3. >indin0 ACintercept
>ind the ACintercept on the0raph itself8 or bAcalculation. A
@
m: Fc
-
8/19/2019 Ch 2 - Guide to Physics Practicals
19/20
>ind the 0radient and the ACintercept ofthis 0raph
-
8/19/2019 Ch 2 - Guide to Physics Practicals
20/20
!:ample of recordin0 data.
Plot this 0raphs "2B%2 vs lBm8 and
